I found who I believe is them in Tecumsah, Lenawee, Michigan, in the 1860 census.
William, 37, Farm laborer, b. England
Miriam, 34, b. eng
Henry, 9, b. eng
Hannah, 7, b. eng
George, 1, b. Canada
James, 1 month, b. Michigan.
Let me see what else I can find.
Kath